Three-Phase Power: Shown in FIG. 5, in schematic form, are three electrically-coupled backplanes 505.A, 505.B, and 505.C, with a first backplane 505.A for A-PEBB converter phase A shown in the foreground. In an alternative embodiment, all three backplanes 505.Z may be structurally integrated into a single physical backplane. For the exemplary A-PEBB converter 500.A, each backplane 505.Z has mounted on its four separate A-PEBB LRUs 200.A.1, . . . , 200.A.4. The three backplanes each function as three phase converters, 203.A, 203.B, 203.C (or “203.P”, in brief), each of which is a power converter 203 for a single phase A, B, or C of the power system 100. The four A-PEBB LRUs 200.A within each phase (A, B, C) are connected 530.1, 530.2 in parallel on both sides of the AFE power stage, enabling dual (un-regulated and regulated) DC buses/links. The four LRUs 200.A.n are connected in series 537 on the AC port/side of the A-PEBB LRUs 200.A. Both un-regulated and regulated LVDC (on both sides of the AFE power stage) of the three phases (A, B, and C) are connected 502 in parallel. The neutrals 504 on the MVAC side of the three phases are tied together.
